s = input()
if s == 'RRR':
    print(3)
elif s[:2] == 'RR' or s[1:] == 'RR':
    print(2)
elif s.count('R') >= 1:
    print(1)
else:
    print(0) s = input() s input() input if s == 'RRR':
    print(3)
elif s[:2] == 'RR' or s[1:] == 'RR':
    print(2)
elif s.count('R') >= 1:
    print(1)
else:
    print(0) s == 'RRR' s 'RRR' print(3) print 3 elif s[:2] == 'RR' or s[1:] == 'RR':
    print(2) s[:2] == 'RR' or s[1:] == 'RR' s[:2] == 'RR' s[:2] s :2 2 'RR' s[1:] == 'RR' s[1:] s 1: 1 'RR' print(2) print 2 elif s.count('R') >= 1:
    print(1) s.count('R') >= 1 s.count('R') s.count s count 'R' 1 print(1) print 1 print(0) print 0 s = input() input() s
s = input()
if s == 'RRR':
    print(3)
elif s[:2] == 'RR' or s[1:] == 'RR':
    print(2)
elif s.count('R') >= 1:
    print(1)
else:
    print(0)